EP3970891A1 - Procédé de fabrication d'un boîtier - Google Patents

Procédé de fabrication d'un boîtier Download PDF

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Publication number
EP3970891A1
EP3970891A1 EP21193051.6A EP21193051A EP3970891A1 EP 3970891 A1 EP3970891 A1 EP 3970891A1 EP 21193051 A EP21193051 A EP 21193051A EP 3970891 A1 EP3970891 A1 EP 3970891A1
Authority
EP
European Patent Office
Prior art keywords
casing
tool
axis
forming member
casing body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21193051.6A
Other languages
German (de)
English (en)
Inventor
Taishi Yoshihara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Compressor Corp
Original Assignee
Mitsubishi Heavy Industries Compressor Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Compressor Corp filed Critical Mitsubishi Heavy Industries Compressor Corp
Publication of EP3970891A1 publication Critical patent/EP3970891A1/fr
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/24—Perforating, i.e. punching holes
    • B21D28/26—Perforating, i.e. punching holes in sheets or flat parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C1/00—Milling machines not designed for particular work or special operations
    • B23C1/16—Milling machines not designed for particular work or special operations specially designed for control by copying devices
    • B23C1/18—Milling machines not designed for particular work or special operations specially designed for control by copying devices for milling while revolving the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C3/00—Milling particular work; Special milling operations; Machines therefor
    • B23C3/02—Milling surfaces of revolution
    • B23C3/04—Milling surfaces of revolution while revolving the work
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2270/00—Details of turning, boring or drilling machines, processes or tools not otherwise provided for
    • B23B2270/56—Turning, boring or drilling tools or machines with provision for milling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2270/00—Details of milling machines, milling processes or milling tools not otherwise provided for
    • B23C2270/18—Milling internal areas of components

Definitions

  • the present disclosure relates to a manufacturing method of a casing.
  • a centrifugal compressor that includes a casing which is formed in a tubular shape and can accommodate a rotor therein.
  • the casing is integrally formed with a suction nozzle or an ejecting nozzle to protrude to an outer side in a radial direction from a body portion of the casing formed in a cylindrical shape.
  • turning processing In order to manufacture such a casing, turning processing is generally used.
  • a table on which a workpiece is placed which is the body portion of the casing formed in a tubular shape in advance, is rotated at high speed around a vertical axis.
  • the workpiece rotates at high speed around the vertical axis together with the table.
  • a tool is inserted into the workpiece formed in a tubular shape on an inner side in the radial direction, and a distal end of the tool is pressed against an inner circumferential surface of the workpiece.
  • the inner circumferential surface of the workpiece which rotates around the vertical axis is moved relative to the distal end of the tool, and the inner circumferential surface of the workpiece is subjected to cutting.
  • the suction nozzle or the ejecting nozzle which protrudes from an outer circumferential surface of the workpiece is formed in the casing.
  • the weight of the suction nozzle or the ejecting nozzle is very large. Therefore, in some cases, the center of gravity of the workpiece itself is eccentric and deviates from a center axis due to the suction nozzle or the ejecting nozzle.
  • a large centrifugal force acts on the workpiece in an eccentric state due to the suction nozzle or ejecting nozzle which is a heavy object.
  • the balance of the workpiece which rotates at a high speed may be greatly lost, and the processing accuracy may not be ensured. Therefore, in order to ensure the balance during processing of the eccentric workpiece, it is necessary to suppress the rotation speed of the table to suppress the influence of the centrifugal force generated by the suction nozzle or the ejecting nozzle. However, in a case in which the rotation speed of the table is suppressed, the time required for the processing is increased.
  • the present disclosure provides a manufacturing method of a casing, in which, even with a large casing, the processing time can be suppressed while suppressing the imbalance during the processing.
  • a manufacturing method of a casing according to an aspect of the present disclosure is a manufacturing method of a casing that includes a casing body which is formed in a tubular shape that is centered on and extends along an axis, and a suction nozzle and a discharge nozzle which protrude from the casing body toward an outer side in a radial direction of the casing body about the axis as a reference and communicate with an inside of the casing body, the method including a step of preparing a casing forming member that includes a casing body forming portion which is formed in a tubular shape and a protruding portion forming portion which protrudes from the casing body forming portion toward the outer side in the radial direction, a step of placing the casing forming member on a table which is rotatable about a table axis which extends in a vertical direction and disposing a tool which is rotatable about a tool axis on an inner side of the casing forming member in the radial
  • a casing 5 configures a part of a rotating machine 1.
  • the rotating machine 1 mainly includes a rotor 2 and the casing 5.
  • the rotating machine 1 is, for example, a multi-stage type centrifugal compressor.
  • the rotor 2 includes a rotor body 3 and a plurality of impellers 4.
  • the rotor body 3 extends in an axial direction Da of an axis Ar.
  • the rotor body 3 is centered on the axis Ar and rotatably supported by a bearing portion (not shown).
  • a direction in which the axis Ar extends is referred to as the axial direction Da.
  • a radial direction of a rotating machine 1 (a casing body 6) about the axis Ar as a reference is simply referred to as a radial direction Dr.
  • a direction around the rotor 2 centered on the axis Ar is defined as a circumferential direction Dc.
  • the plurality of impellers 4 are arranged at intervals in the axial direction Da. Each of the impellers 4 is fixed to the rotor body 3 on the outer side in the radial direction Dr. Each of the impellers 4 can rotate about the axis Ar integrally with the rotor body 3.
  • the casing 5 is disposed to cover the rotor 2.
  • the casing 5 includes a casing body 6, a suction nozzle 71, and a discharge nozzle 72.
  • the casing body 6 is formed in a tubular shape extending in the axial direction Da of the axis Ar.
  • the suction nozzle 71 and the discharge nozzle 72 protrude from the casing body 6 toward an outer side Dro in the radial direction Dr.
  • the suction nozzle 71 guides the working fluid which is supplied from the outside to the inside of the casing body 6.
  • the discharge nozzle 72 discharges the working fluid which has flowed inside the casing body 6 to the outside.
  • the casing 5 described above is formed by cutting a casing forming member 100 (see FIG. 3 ) formed in advance into a predetermined shape.
  • a manufacturing method S 1 of the casing 5 includes a step S2 of preparing the casing forming member 100, a step S3 of placing the casing forming member 100 on a table 21 and disposing a tool 22, and a step S4 of forming the casing 5.
  • the casing forming member 100 is prepared.
  • the casing forming member 100 includes a casing body forming portion 101 in which the casing body 6 is formed, and a protruding portion forming portion 102 in which a protruding portion which protrudes from the casing body 6 such as the suction nozzle 71 or the discharge nozzle 72 is formed.
  • the casing body forming portion 101 becomes the casing body 6 by being subjected to a predetermined processing.
  • the casing body forming portion 101 is formed in a tubular shape extending in the axial direction Da of the axis Ar.
  • the protruding portion forming portion 102 becomes the suction nozzle 71 or the discharge nozzle 72 by being subjected to a predetermined processing.
  • the protruding portion forming portion 102 protrudes from the casing body forming portion 101 toward the outer side Dro in the radial direction Dr.
  • the casing forming member 100 is formed into a predetermined shape close to the shape of the casing 5 by, for example, casting, forging, steel plate welding assembly, a laminating shaping method, or the like.
  • step S2 of preparing the casing forming member 100 as shown in FIG. 4 , an end surface of the casing body forming portion 101 on a first side Da1 (first end of the casing body forming portion 101) in the axial direction Da of the casing forming member 100 which is formed in the predetermined shape is cut.
  • a first reference surface 201 which serves as a reference when the casing body forming portion 101 is processed, is formed.
  • the first reference surface 201 is formed by leaving a cutting allowance with a thickness of, for example, several mm on an end surface 6s (see FIG. 1 ) of the finally formed casing body 6 on the first side Da1 in the axial direction Da.
  • step S2 of preparing the casing forming member 100 an inner circumferential surface 101g of the casing body forming portion 101 is cut from a second side Da2 (second end of the casing body forming portion 101) in the axial direction Da of the casing body forming portion 101.
  • a second reference surface 202 for centering the casing body forming portion 101 is formed.
  • the second reference surface 202 is formed by leaving a cutting allowance with a thickness of, for example, several mm on an inner circumferential surface 6g of the casing body 6 of the finally formed casing 5.
  • the table 21 is formed, for example, in a circular shape as viewed from a vertical direction Dv.
  • the table 21 has a placing surface 21a orthogonal to the vertical direction Dv.
  • the table 21 is configured to be rotatable about the table axis 21s which extends in the vertical direction Dv.
  • the table 21 is rotationally driven about the table axis 21s by a table drive mechanism 22m provided with a motor, a speed reducer, and the like.
  • the casing forming member 100 is installed in a state in which the first reference surface 201 formed in step S2 is in contact with the placing surface 21a.
  • the casing body forming portion 101 is disposed to be centered such that the table axis 21s and the axis Ar are coaxial with each other by using the second reference surface 202.
  • step S4 of forming the casing 5 while the table 21 is rotated, the inner circumferential surface 101g of the casing body forming portion 101 is subjected to the cutting by the tool 22 to form the casing body 6.
  • the table 21 is rotated about the table axis 21s by the table drive mechanism 22m at a table rotation speed (table rotation speed) which is set in advance.
  • table rotation speed table rotation speed
  • step S4 the tool 22 is inserted into the casing body forming portion 101 placed on the table 21 on an inner side Dri in the radial direction Dr.
  • the tool 22 is inserted into the casing body forming portion 101 on the inner side Dri in the radial direction Dr upward in the vertical direction Dv, that is, to the casing body forming portion 101 toward the first side Da1 from the second side Da2 in the axial direction Da.
  • the tool 22 is held by a main spindle 51 of a processing machine 50.
  • the main spindle 51 is movably supported by a main spindle moving mechanism (not shown) in the vertical direction Dv and the radial direction Dr of the casing body forming portion 101 orthogonal to the vertical direction Dv.
  • the main spindle 51 is rotationally driven about an operation axis 51s which extends in the vertical direction Dv by a main spindle rotation drive mechanism (not shown) provided with a motor, a speed reducer, or the like.
  • the tool 22 is connected to the main spindle 51 via a head 52.
  • the tool 22 is held by the main spindle 51 via the head 52 such that the tool axis 22s extends in the radial direction Dr.
  • the head 52 converts the rotation of the main spindle 51 into the rotation in the horizontal direction like the right angle head.
  • the tool 22 extends such that the tool axis 22s intersects with (is orthogonal to) the table axis 21s.
  • the head 52 transmits the rotation of the main spindle 51 to the tool axis 22s of the tool 22 via a gear (not shown) or the like.
  • the tool 22 disposed on the casing body forming portion 101 on the inner side Dri in the radial direction Dr is orthogonal to the axis Ar and is rotated about the tool axis 22s which extends in the radial direction Dr at the tool rotation speed (tool rotation speed) which is set in advance.
  • the tool rotation speed of the tool 22 which is set in advance is set to be higher than the table rotation speed of the table 21. Therefore, the table 21 rotates more slowly than the tool 22.
  • the table rotation speed of the table 21 is preferably, for example, 0 rpm or more and 1 rpm or less. It is more preferable that the table rotation speed be as close as possible to 0.1 rpm.
  • the tool rotation speed of the tool 22 be appropriately set such that desired cutting at the cutting speed at the cutting edge of the tool 22 can be satisfactorily performed on the casing forming member 100 that rotates together with the table 21 at the table rotation speed described above. That is, the tool rotation speed is set such that the relative speed of the tool 22 with respect to the table 21 becomes the desired cutting speed.
  • the tool rotation speed which is the rotation speed of the tool 22 is about 500 rpm.
  • step S4 of forming the casing 5 in a state in which the table 21 and the tool 22 are rotated as described above the casing body forming portion 101 is subjected to the cutting by the tool 22. Specifically, the casing forming member 100 is rotated by the table drive mechanism 22m together with the table 21 at a predetermined table rotation speed, and the main spindle 51 is moved by the main spindle moving mechanism (not shown) to a predetermined position. In this state, the distal end of the tool 22 which rotates around the tool axis 22s is pressed against the inner circumferential surface 101g of the casing body forming portion 101.
  • the rotating tool 22 is moved relative to the inner circumferential surface 101g of the casing body forming portion 101 in the circumferential direction Dc around the table axis 21s. Further, the tool 22 is moved by the main spindle moving mechanism (not shown) together with the main spindle 51 in the vertical direction Dv at a movement speed set in advance. As a result, the inner circumferential surface 101g of the casing body forming portion 101 is cut by the tool 22 at intervals of one circumference/pitch centered on the table axis 21s, and is intermittently cut.
  • step S4 by returning the process to step S3 and vertically inverting the direction of the axial direction Da of the casing body forming portion 101 in the middle to carry out step S4, the inner circumferential surface 101g of the casing body forming portion 101 is processed from both sides in the axial direction Da.
  • step S4 By performing the processing while changing the direction of the casing body forming portion 101 in this way, roughing processing or finishing processing is performed, and the casing body 6 which has a predetermined dimension is formed.
  • the suction nozzle 71 or the discharge nozzle 72 is formed by performing various processing such as serration processing and drilling processing on the protruding portion forming portion 102 at any timing. Therefore, the suction nozzle 71 or the discharge nozzle 72 may be formed in step S2 of preparing before step S3, may be formed in the middle of step S4 of forming the casing 5 as in the middle of vertical inversion of the casing forming member 100, or may be formed after step S4 of forming the casing 5.
  • a processing mark T1 is formed.
  • this processing mark T1 an arcuate cut mark peculiar to so-called milling, in which the cutting is performed while rotating the tool 22 around the tool axis 22s which extends in the radial direction Dr, remains.
  • the processing mark T1 is continuous in the circumferential direction Dc (left-right direction on the paper surface in FIG. 6 ).
  • the processing mark T1 continuous in the circumferential direction Dc is formed in the vertical direction Dv (axial direction Da: up-down direction on the paper surface in FIG. 6 ) with a predetermined pitch width, and the boundaries thereof are remarkably observed.
  • a processing mark T11 as shown in FIG. 7 is formed.
  • cutting is performed while feeding the distal end of a tip attached to the fixed tool at a fine pitch. Therefore, the processing mark T11 has a linear cutting mark formed in the circumferential direction Dc, and is in a significantly different state from the processing mark T1 of the present embodiment.
  • the inner circumferential surface 101g of the casing body forming portion 101 is subjected to the cutting by the tool 22 being rotated about the tool axis 22s while rotating the table 21 about the table axis 21s together with the casing forming member 100, which is placed on the table 21.
  • the relative displacement speed between the tool 22 and the inner circumferential surface 101g of the casing body forming portion 101 is the sum of the circumferential speed of the casing body forming portion 101 which rotates together with the table 21 and the circumferential speed of the tool 22 which rotates around the tool axis 22s.
  • the rotation speed of the table 21 around the table axis 21s is lower than the rotation speed of the tool 22 around the tool axis 22s. Therefore, the circumferential speed of the casing forming member 100 around the table axis 21s can be suppressed to be low. As a result, the centrifugal force generated in the casing 5 during the processing can be suppressed more reliably. As a result, the tilting of the casing 5 during the processing can be suppressed, so that highly accurate processing that satisfies the required product accuracy (coaxiality) is possible.
  • the tool axis 22s of the tool 22 extends in the radial direction Dr to intersect with the table axis 21s by the head 52. Therefore, processing with the tool 22 can be performed with a high degree of freedom depending on the shape of the inner circumferential surface 101g of the casing body forming portion 101.
  • the tool 22 that rotates around the tool axis 22s which extends in the radial direction Dr is connected to the main spindle 51 via the head 52, but the tool 22 is not limited to being disposed in such a direction.
  • a tool 22B is held by the main spindle 51 which extends in parallel with the table axis 21s via a head 52B.
  • the tool 22B is held by the head 52B at a position offset in the radial direction Dr intersecting with the operation axis 51s of the main spindle 51.
  • the head 52B moves the position of a tool axis 22t in parallel with the operation axis 51s in the radial direction Dr like a universal attachment.
  • the tool axis 22t extends in parallel with the table axis 21s at a position deviated from the operation axis 51s in the radial direction Dr.
  • the head 52B transmits the rotation of the main spindle 51 around the operation axis 51s to the tool axis 22t of the tool 22B via a gear (not shown) or the like.
  • the cutting can be performed on the casing body forming portion 101 that rotates together with the table 21, as in the above embodiment. That is, the cutting can be performed by using the tool 22B that rotates about the tool axis 22t which extends in parallel with the table axis 21s at a position offset from the operation axis 51s of the main spindle 51. As a result, processing with the tool 22 can be performed with a high degree of freedom depending on the shape of the inner circumferential surface 101g of the casing body forming portion 101.
  • a processing mark T2 as shown in FIG. 9 is formed.
  • the processing mark T2 is left with a scaly cutting mark by the tool 22B.
  • the processing mark T2 is continuous in the circumferential direction Dc (left-right direction on the paper surface in FIG. 9 ).
  • the processing mark T2 continuous in the circumferential direction Dc is formed in the vertical direction Dv (axial direction Da: up-down direction on the paper surface in FIG. 9 ) with a predetermined pitch width, and the boundaries thereof are remarkably observed.
  • the casing forming member 100 is processed by vertically inverting the first side Da1 in the axial direction Da and the second side Da2 in the axial direction Da, but the present disclosure is not limited to this. Depending on the size of the casing forming member 100, the casing forming member 100 may be processed without being vertically inverted.
  • the centrifugal compressor is shown as an example of the rotating machine 1, but the present disclosure is not limited to this.
  • the rotating machine 1 may be a steam turbine or the like.
  • the manufacturing method S1 of the casing 5 according to the embodiment can be understood, for example, as follows.
  • a manufacturing method S1 of a casing 5 is the manufacturing method S1 of the casing 5 that includes a casing body 6 which is formed in a tubular shape that is centered on and extends along an axis Ar, and a suction nozzle 71 and a discharge nozzle 72 which protrude from the casing body 6 toward an outer side Dro in a radial direction Dr of the casing body 6 about the axis Ar as a reference and communicate with an inside of the casing body 6, the method including a step S2 of preparing a casing forming member 100 that includes a casing body forming portion 101 which is formed in a tubular shape and a protruding portion forming portion 102 which protrudes from the casing body forming portion 101 toward the outer side Dro in the radial direction Dr, a step S3 of placing the casing forming member 100 on a table 21 which is rotatable about a table axis 21s which extends in a vertical direction Dv and disposing
  • the relative displacement speed between the tool 22 and the inner circumferential surface 101g of the casing body forming portion 101 is the sum of the circumferential speed of the casing body forming portion 101 which rotates together with the table 21 and the circumferential speed of the tool 22 which rotates around the tool axis 22s. Therefore, by increasing the circumferential speed of the tool 22 around the tool axis 22s, it is possible to perform the cutting with high accuracy even in a case in which the circumferential speed of the casing forming member 100 around the table axis 21s is suppressed. As a result, even in the large casing 5, the centrifugal force generated in the casing forming member 100 during the processing can be suppressed. As a result, even with the large casing 5, it is possible to suppress the processing time while suppressing the imbalance during the processing.
  • the manufacturing method S1 of the casing 5 according to a second aspect is the manufacturing method S1 of the casing 5 according to (1), in which a rotation speed of the table 21 about the table axis 21s may be lower than a rotation speed of the tool 22 about the tool axis 22s.
  • the circumferential speed of the casing forming member 100 around the table axis 21s can be suppressed to be low.
  • the centrifugal force generated in the casing 5 during the processing can be suppressed more reliably.
  • the manufacturing method S1 of the casing 5 according to a third aspect is the manufacturing method S1 of the casing 5 according to (1) or (2), in which the tool axis 22s of the tool 22 may extend to intersect with the table axis 21s.
  • processing with the tool 22 can be performed with a high degree of freedom depending on the shape of the inner circumferential surface 101g of the casing body forming portion 101.
  • the manufacturing method S1 of the casing 5 according to a fourth aspect is the manufacturing method S1 of the casing 5 according to (1) or (2), in which the tool axis 22t of the tool 22 may extend in parallel with the table axis 21s.
  • processing with the tool 22 can be performed with a high degree of freedom depending on the shape of the inner circumferential surface 101g of the casing body forming portion 101.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Milling Processes (AREA)
EP21193051.6A 2020-09-15 2021-08-25 Procédé de fabrication d'un boîtier Pending EP3970891A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2020154460A JP7542372B2 (ja) 2020-09-15 2020-09-15 車室の製造方法

Publications (1)

Publication Number Publication Date
EP3970891A1 true EP3970891A1 (fr) 2022-03-23

Family

ID=77499737

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21193051.6A Pending EP3970891A1 (fr) 2020-09-15 2021-08-25 Procédé de fabrication d'un boîtier

Country Status (4)

Country Link
US (1) US11648600B2 (fr)
EP (1) EP3970891A1 (fr)
JP (1) JP7542372B2 (fr)
CN (1) CN114178780B (fr)

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US11648600B2 (en) 2023-05-16

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